Operating gear



@at E6, E923,

W. T. TABB OPERATINGy GEAR Filed Ma'rch 18. 1920 2 Sheets-Sheet 2 ATTORNEY YPatented @et 16, Y1923.

i TED y' goifeRATmG @ma VBe it'lknownlthat I; WARNER TfTABBQe' stion.' Y it QI' have invented en improvedopemting ,gea r -speeially' m Qpeifatmg 'gea-r designed feo'fbe AuseflfonA rthrottle V land. 'has for its y"dbjeetwto .pijovide meansV bo Y shioii dem'nlded by operating ;eonditions. In Ilts preferred ormgfthe 'invention emlbaces ka resilient 'element 'located between en' en the Sine? HY mention. 1, iFigure f Figure 4 ,what izippeerson "Figureg file one fof the springyplat'es employedin "Figurellsis arisideviewof afleve'foirmov- Figure '1:5 showsyozieof theadjustilig *eicH i i A@entries Afor thev vzi'lve;

mounted;

'f Figure 16 fis section-:0n une fie-iifFig? i plates areinonted; gand l The"-sazme linumeml .the ASande I thepartieiila.. oeseiptioiiof the Stroef not Tegi'ster, they valv'e'is Ciosed*"The pol- Y il'. tion supports the operating rgeen' for 'the waive; "Wrhieh is conneete to vthe 'operating to asnlall hub thereon; land being led therefrom out through bearings in the sides of the portion 2, and Caused to engagea pivoted rocker 10. W hen the rocker moves the valve is of course rotated. I do not claim-the valve in this `application,fas the same is more fully Asetforth'and Aspe'cilied Vin the claims of my .copending application for a Patent- Yo;V

367012 filed" of veven `date herewith.

In practice, it isessential that the valve move gradually over its entire range from opening toy closing and vice versa. vIt yis designed to be actuatedby a movable member in the form of a `plunger 11 thatV serves' as an arma-ture located adjacentone end of any electromagnet or Vsolenoid vcoil 12. This magnet has a core 13 that Vextends into it from the opposite end, yand the adjacenty endsfofthe armature and the core are sepay rated by alsmall air gap. As is well known,y r the force or pull exerted by a ,magnetincreasesv very rapidly asthe air gap between pole and armature decreasesg'and this fact must be taken into account in connecting the valvefand the armature, if a gradual and uniform movement ofthe valve inl response F to unequal varia-tions y in the `effective strength orpull of the magnet is .to be had.' Ithe'refore mount on: the portion 4'resiliy ent meansin the forni of a leafor bowy n spring 14, held at its ends, but free to .bend

inthe middle.; This spring is adapted to be flexedby the magnet,`when the magnet is energized; and the spring then acts through the rocker 10 to turn the valve towards closed position.- lhen the magnet weakens orv` ceases to be energized, the elasticity of V the spring asserts itself and the rocker is caused Ito return :the valve to full open position. i Hence the'valve isractuated gradually and uniformly, as required.` The mode of operationjis fully. illustrated withv reference tc the diagram in Figure A22, which will f Vbe explained fully hereinafter.

,The ends "of the spring 14 are `engaged by plates `15,"pivot'ed to the portion i-:byV pins or bolts lzand having flanges or yrims 17 A atptheirfree endsin whichthe extremities ofthe spring may work- :Attheirfree ends theseplate's Vare engaged by'adjust-ing means vorz'devices in the 'formi of eccentrics 18 (Figkures 18gand19) in the portinv4, and the angularity ofthese plates in relation to the spring 14.by such means can beV regulated;

that is, the characteristics of the. spring can befchanged as required.- These `eccentrics .A n. hayeijournals `or trunnionsf19 at their'ex i tremities 1to1 enable 1 them to bepivotally mountedin, the'portion 4 and in the trunnions of eachl is a ker-20 for a tool'to enable the ecc'entrics to 'be lturned as desired.

EachV kerf .is ,covered by va lock washer 21 and locknut 22, arranged in counterbores' in"H thek ortion v4,: 1159securelthe eccentrics inA lrequire position. "See Figure `17, which vbut mounted in the same way.

kthe manner in which the bolts 16 and the shows similar eccentrics forvanother part, Of course eccentrics 18 are held in the vcasting are matters of mechanical detail, and need ynot be i further described. f

The spring 14 is preferably arranged to lbe fieXed in a plane parallel to the valve Y 5, and it extends between the arms 23 of @a yoke 24. This yoke carries a 'flexible element 25, secured by an adjustable screw 26 to the'plunger 11,'this spring and screw vmaking an adjustable connection between the plungery and the yoke.` Between the arms23 a pressure bar 27, which engages i the spring 14, so that when the plunger 11 pulls onY theyoke, thespring 14 is bent accordingly. y'lhesha-nk of the yoke 24 has' the form of a pair of perforated lugs 28, pinned, to a lever 29, which is joined'by a link 30 to the rocker 10. This lever has` a pivot in the form of a bolt 31 at one end, and carries atits other a tonguev 32, located between adjusting devices or eccentrics like v the eccentricsl 18, `and having similar kerfs,

ywith washers and nuts yto hold them in a yThe mode offoperation will now be clear.V 1When the magnet is energized, the spring 14 is flexed vand the yoke 24 made to pull on the lever 29 to move the rocker 10. This rocker, which is pivoted to the casting by a'bolt 36, lhas projections 37 at its ends,

and over these vprojections the terminal por-v tions of the wire 8 arejpassedy and joined A milled disk 35 on the screw 33 enby aspring 38; This wire is secured against Yslippingrby a clamp `39, fastened. to the rocker by screws; and the movement -of the rocker thusy produces a ymovement of thel .valve-- lVhen the magnetic pull diminishes orv ceases, the-'valve v'moves back towards open position. The magnet is energized ,1n

accordance -with the speed of the engine upon which the valve is placed, and when thegspeed approaches the lpredetermined limit,..itn..acts to move ythe valvey towards closed 'positionV and throttle the supply of motive agent. TheA yalvel 5 may be .located in the fuelintake conduit of an internal combustion engine, or it may be used in the intake pipe ofa steamengine,vor'other unit aswell.V

V'In Figure 22, Ishow curves A and B, in-

dicating Vfor the sake' of example the pull of the magnet for limitingl Speeds of the en-` Y gine of and 406)@ revolutions respee tively. From any lpoint on either curvegtbe" zorital airis UX. fgivestheY pull inkpounds hefrizontal4 Ydistance to" vertnal kanis gives'the `increase inv airgap, and. tbe vdistance from any point on either curve .to'tbelhoril exerted by theA magnet throughA sncblj'gap.

Y `Hence, the Vpull is greatestwhen-the-airgap is smallest; 'The curve Cjrelates to the spring 14. :The distance between any pointthereon and the line OY gives thezdegree' ofmoveff c ment of the plungerll thatis, the degree offlexing of the spring; and the distance between any point on'the Ccurve'andthe line X gives the pressure on the Spring needed;V

to deiect it in pounds. The Spring isbent the most when the airgap is smallestand the,

magnet pull the strongest. The 'shape ofthel curve C approximates that ofthe `curves vA Y and B. These curves A and B show `also how much more rapidly'the pull of the Vmagfj netlinc'reasesv as Vrthe airgap lessens p If va* spiral spring ora simple `bow spring werer` Vemployedinstead of the combinationof bow spring14 and platesl shown inV Figures 1 and 2, the shape of the `curve C ywould beY entirely di'erent from the shape shown, and the similarity of this curve to `the vcurves A;

and B would not exist; therestrainingacl-V tion ofthe spring would notbear the'proper relation to thev motive action of the'magnet sameway as the'pull of the magnet varies and a gradual or uniform movement of the valve` between its open and closed positions"rv is obtained. The effect' isjsecure'd'whether Vdirect or alternatingcurrent t0 energzeth I 'magnet be employd,` v l e The curve `D shows the Themagnetthus throttles the vengine byk closing the valveflittle by little,lto cut o the motive age1itga-nd`checlrithe enginefas the` limiting speed approached; Ifk this speed. for'any reason be' eXceeded,`-the valve-would momentarily closer and cutv off Vthe vrmotive agententirely, but `would reopen the instant the speed ofthe engine drops.

The vcoil 12 is provided support the'corerl.' Any suitable structure of magnet that will lservefthepurposef-may `be utilized. Thelterminals ofthe coil are indicated at 44.

l p Thevpressure bar-27 may 'beloosely' tted c c same characteristic as thecurve C for an'ordmaryrspiralspring.kk

upon; "the ena'oftiezscrew 33, and fone ene c ofthe bary may havey a recess or 'to engage s; kever-'projection telinthe yoke a4 to keep' .thejsrbarentrue tran''sverse poc sitios, wien f1 regard teigtlie spring 514 'w-bile permaittingit to -movegtowards'or from the splringas-.thef screw 33 returned. l

Havingl describ y.States is :f-

fprotectibyLetters ,Patent of the United Y Y Y ai mymvent'on,=wl1atl i believe to benew and desireto secure and' Y .1.- Theeombination of .a magnet, a; valve i Ldesigned toenable 'the magnetto actuate fthe `,valve gradually and uniformlyfin re-V ,to beactuatedbythemagnet, and resilient i' fmeans betweenfthe magnet and the valve spense "to unequal variations ,in the force exerted fbyith'e magnet.V y y l, Y 2.A The-combination of a magnet, an arl'.`

.85 mature'a valve,and-a?V bow spring betweenv ,f l. f

Vmature therefor, a' yoke connected to the ar- `said va vefand saidyoke;

,Y 3. The combination of a magnet, avalvekv Vto be actnatedy by the` magnet, resilient means] `between the magnet and VtheY ,valve v designedto enable themagnettof actuate'the valvef silient means'.

c, 4.1"Thecombination-V ofa magnet, an arf' perating gear :comprising ka .7 bow graduallyandyiiniformly in response to unequalv variations in lthe 'force vexerted by the: ymagnet,iandmeans for adjusting said re- `mature forV same, a yoke connected to theY .i i

"spring, a; pair of ypivot'ed plates, each Vofi which engages'said springadjacent the ends thefp'ressure lofsaid yplates' Yon said spring. Operatinggearcomprising a yoke, a movable lmember, an adjustable connection thereon, and; adjusting' vdevices to regulate ybet-.tween said yoke and said member, a lever Y f pinned to'theshanlof saidyoke, Va rocker vrvlinked 'toV 'thef'leven and; a bow spring between `the armsjoi` said yoke and normally opposing thefmovementfof same. Y Y g Y 7. Thercombination ofvayoke, a pressure fbar'extendingbetween'the arms thereof, and

-bowfspring heldfat its opposite ends and A being engaged bysaid bar intermediate said ,y

ends. f

spring held; at its opposite ends, a: bar carv Vi ried by the :armsfiof saidyoketo engage l with krianges 401? securedto the portion 4 of the castingl 'bytie bolts/41'. These tie bolts engage', retaining bars 42 at-their'outer ends, andto thesek Y -bars are attachedfbent 'metallic strips 43 to f's'aidspring betweensaid ends, and adjusting devices lfor the ends of thespring. Y

z 9. The combinationjof a yoke,y a` movable imember adjustably connectedto the yoke A ,to move same, and abowfspring between the'yoke toopposethe movement the arms of theliof;

"a'vflever pinned to the'zshank ofthe yoke, and

ofthe lever. r` Y Y 11;V A. yoke, a movable member Jcooperate same,- a bovvA` springv between the arms of the yoke, Asaolsprng beng'held against' movement at its iends; a pressure' bar be' adjustable devices to. ylimit the movement 'tWeen the ends of,';theyoke to engage `the* spring, and. an adjusting screw tooontrol` 

